The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/nfs/xdr_subs.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * Rick Macklem at The University of Guelph.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)xdr_subs.h  8.3 (Berkeley) 3/30/95
   35  * $FreeBSD: releng/12.0/sys/nfs/xdr_subs.h 326023 2017-11-20 19:43:44Z pfg $
   36  */
   37 
   38 
   39 #ifndef _NFS_XDR_SUBS_H_
   40 #define _NFS_XDR_SUBS_H_
   41 
   42 /*
   43  * Macros used for conversion to/from xdr representation by nfs...
   44  * These use the MACHINE DEPENDENT routines ntohl, htonl
   45  * As defined by "XDR: External Data Representation Standard" RFC1014
   46  *
   47  * To simplify the implementation, we use ntohl/htonl even on big-endian
   48  * machines, and count on them being `#define'd away.  Some of these
   49  * might be slightly more efficient as quad_t copies on a big-endian,
   50  * but we cannot count on their alignment anyway.
   51  */
   52 
   53 #define fxdr_unsigned(t, v)     ((t)ntohl((int32_t)(v)))
   54 #define txdr_unsigned(v)        (htonl((int32_t)(v)))
   55 
   56 #define fxdr_nfsv2time(f, t) \
   57 do { \
   58         (t)->tv_sec = ntohl(((struct nfsv2_time *)(f))->nfsv2_sec); \
   59         if (((struct nfsv2_time *)(f))->nfsv2_usec != 0xffffffff) \
   60                 (t)->tv_nsec = 1000 * ntohl(((struct nfsv2_time *)(f))->nfsv2_usec); \
   61         else \
   62                 (t)->tv_nsec = 0; \
   63 } while (0)
   64 #define txdr_nfsv2time(f, t) \
   65 do { \
   66         ((struct nfsv2_time *)(t))->nfsv2_sec = htonl((f)->tv_sec); \
   67         if ((f)->tv_nsec != -1) \
   68                 ((struct nfsv2_time *)(t))->nfsv2_usec = htonl((f)->tv_nsec / 1000); \
   69         else \
   70                 ((struct nfsv2_time *)(t))->nfsv2_usec = 0xffffffff; \
   71 } while (0)
   72 
   73 #define fxdr_nfsv3time(f, t) \
   74 do { \
   75         (t)->tv_sec = ntohl(((struct nfsv3_time *)(f))->nfsv3_sec); \
   76         (t)->tv_nsec = ntohl(((struct nfsv3_time *)(f))->nfsv3_nsec); \
   77 } while (0)
   78 #define txdr_nfsv3time(f, t) \
   79 do { \
   80         ((struct nfsv3_time *)(t))->nfsv3_sec = htonl((f)->tv_sec); \
   81         ((struct nfsv3_time *)(t))->nfsv3_nsec = htonl((f)->tv_nsec); \
   82 } while (0)
   83 
   84 #define fxdr_hyper(f) \
   85         ((((u_quad_t)ntohl(((u_int32_t *)(f))[0])) << 32) | \
   86          (u_quad_t)(ntohl(((u_int32_t *)(f))[1])))
   87 #define txdr_hyper(f, t) \
   88 do { \
   89         ((u_int32_t *)(t))[0] = htonl((u_int32_t)((f) >> 32)); \
   90         ((u_int32_t *)(t))[1] = htonl((u_int32_t)((f) & 0xffffffff)); \
   91 } while (0)
   92 
   93 #endif

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